Poly(arylene sulfide) composition, molding method and article of manufacture

Abstract

A composition is provided containing a poly(arylene sulfide) and a hydrotalcite. The composition can further contain glass fibers and is suitable as a molding composition. The hydrotalcite-containing poly(arylene sulfide) provides a molding composition which offers the combination of mold corrosion inhibition, hydrolytic stability and insulation resistance compared with prior molding compositions. Also provided is an article of manufacture comprising a hydrotalcite-containing poly(arylene sulfide) molded part in contact with a liquid electrolyte. The use of hydrotalcite-containing resin reduces the effect of corrosive ionic species extractable from the poly(arylene sulfide) by the electrolyte. Such an article of manufacture would include, for example, a capacitor having a liquid electrolyte and a poly(arylene sulfide) cover.

We claim: 
     
       1. A composition comprising (a) a poly(arylene sulfide) and   (b) a hydrotalcite.   
     
     
       2. The composition of claim 1 in which the hydrotalcite is an aluminum hydroxy carbonate. 
     
     
       3. The composition of claim 1 in which the hydrotalcite is a magnesium aluminum hydroxy carbonate. 
     
     
       4. The composition of claim 1 in which the hydrotalcite is present in the composition in an amount of from about 0.01 to about 10 weight percent, based on the weight of the composition. 
     
     
       5. The composition of claim 1 in which the poly(arylene sulfide) comprises aromatic units at least 90 mole percent of which are unsubstituted monoaromatic units joined by sulfide linkages. 
     
     
       6. The composition of claim 1 in which the poly(arylene sulfide) is poly(phenylene sulfide). 
     
     
       7. The composition of claim 1 in which the poly(arylene sulfide) has a melt flow in the range of about 20 to about 1000 g/10 min. 
     
     
       8. The composition of claim 4 which further comprises glass fiber present in the composition in an amount of from about 20 to about 60 weight percent, based on the weight of the composition. 
     
     
       9. The composition of claim 8 in which the poly(arylene sulfide) comprises aromatic units at least about 90 percent of which are unsubstituted monoaromatic units. 
     
     
       10. The composition of claim 9 in which the hydrotalcite is an aluminum hydroxy carbonate present in an amount of from about 0.10 to about 5 weight percent, based on the weight of the composition. 
     
     
       11. The composition of claim 9 in which the hydrotalcite is a magnesium aluminum hydroxy carbonate present in an amount of from about 0.10 to about 5 weight percent, based on the weight of the composition. 
     
     
       12. The composition of claim 9 in which the hydrotalcite is present in an amount of from about 0.50 to about 5 weight percent, based on the weight of the composition. 
     
     
       13. The composition of claim 9 in which the melt flow of the poly(arylene sulfide) is greater than about 750 g/10 min. 
     
     
       14. The composition of claim 13 which further comprises a filler selected from the group consisting of silica, wollostonite and glass. 
     
     
       15. The composition of claim 14 which further comprises zinc oxide. 
     
     
       16. The composition of claim 12 which further comprises an organosilane. 
     
     
       17. The composition of claim 16 in which the organosilane is a trialkoxysilane. 
     
     
       18. The composition of claim 12 in which the poly(arylene sulfide) is annealed. 
     
     
       19. The composition of claim 12 which further contains lithium carbonate. 
     
     
       20. A composition comprising an intimate mixture of (a) a poly(arylene sulfide) resin having a melt flow in the range of about 20 to about 1000;   (b) about 0.5 to about 5 weight percent, based on the weight of the composition, of a magnesium aluminum hydroxide carbonate hydrate; and   (c) about 20 to about 60 weight percent, based on the weight of the composition, of glass particles.   
     
     
       21. The composition of claim 19 which further comprises about 0.005 to about 1 weight percent, based on the weight of the poly(arylene sulfide), of an organosilane. 
     
     
       22. The composition of claim 19 which further comprises about 0.005 to about 1 weight percent, based on the weight of the poly(arylene sulfide), of zinc stearate. 
     
     
       23. The composition of claim 19 which further comprises about 0.1 to about 2 weight percent, based on the weight of the composition, of polyethylene having a density in the range of about 0.92 to about 0.95 g/cc. 
     
     
       24. The composition of claim 19 which further comprises from about 10 to about 40 weight percent, based on the weight of the composition, of a mineral filler.